Someone who would make you laugh any time of day. Someone who would love you the way you are hopefully.
Not talking about someone who has a gun.
Talking about someone who is tall, and has a smile that would make your day.

Someone who, you hope, would care about you and love you the way you are.
Someone whose voice makes you smile.
Someone that you can depend on.
Someone who gives awkward hugs, and doesn't give many hugs. But you wish that he would give you a hug every time you're with him.
Someone who is an awesome friend to have.

Friend 1: Awe, you two look cute together, and he seems like an awesome friend.
Friend 2: Haha thanks, Gunner is awesome. And when he smiles... Man, I wish I could just give him an awkward hug.
Friend 1: Aweee, that's cute. :) Do you love him?
Friend 2: ...Maybe. I want to stay as close friends first though. I love him too much right now to change anything.

A person who is competitive,overly-ambitious and substantially exceeds minimum requirements. A gunner will compromise his/her peer relationships and/or reputation among peers in order to obtain recognition and praise from his/her superiors.

That chic in the front row of our class who always raises her hand, takes on additional assignments, and wrote a 25 page answer on our final when all that was required was 10 pages is such a gunner.

A person (usually a medical or law school student) who uses over 3 different colored highlighters, tabs every page in their notebook, and raises their hand after every question asked by their professor, regardless of if they know the correct answer or not. Gunners like to hear themselves speak. They use complicated words to make themselves sound smart even though they have no idea what's going on in class- they pretend they do. They are trying to intimidate you and eliminate competiton.

This gunner in my Chemistry class answers every question the professor asks, asked 5 questions during a 1hr class, and uses 8 different colored highlighters.